/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraParameterDefinitionsSubscriberViewModel.h
Find a parameter definitions owned UNiagaraSCriptVariable with a matching parameter nameFName, or otherwise return nullptr.
[UNiagaraScriptVariable](API\Plugins\NiagaraEditor\UNiagaraScriptVariable) * FindSubscribedParameterDefinitionsScriptVarByName ( const [FName](API\Runtime\Core\UObject\FName) & ScriptVarName )